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York YT Dead on arrival

This chiller is down. optiview screen dark. I just printed off the 160.55 M-1
manual.
I have no other documentation for this chiller/wiring diagrams etc.
The micro has a solid green LED lit.
I only have had to trouble shoot starter issues with this loud bugger.
Any experiences would be helpful
Thank you

With no documentation I did a few things to get started.
Power supply outputs were 5vdc \12 vdc
I unplugged each input and output on the micro and tried to reboot. no success.
i have since printed off the optiview manual(160.55M-1)and scoured this site for more info.
I need to pay close attention to the actual power supply voltages.
I also need a wiring diagram for this panel.
with a green led im assuming the LCD should be lit up.

turned out to be a bad J1 plug connection on the main board from the power supply.
used a tip cleaner plugged here back in and away she went.
cycled power off a dozen times, came back up without fail.
had the office order a new plug.
thanks to all